Pump



June 8, 1937.

H. E. DELvlN 2,083,009

PUMP

Filed March l2, 1954 2 Sheets-Sheet l @/L' .1. 56 e g 56 |l z I y i N' f5 i I F I HiT A'TTORNEY Patented June d, 1937 PUMP Hart E. Delvin, Stanley, N. Y.

Application March 12, 1934, Serial No. 715,196

S Claims. v (Cl. B-205) Y 5 An object of the invention is to provide a power actuated pump, of reciprocating type, that is compact, effective and instantly available.

This application is specically directed to pumps. Certain features of the operating mechlo anisrn, particularly the peculiar thread structure on the cylinder walls and piston, when associated with appropriate mechanism, are, however, capable of more general utilization and are made the subject of my copending application, Serial l5 No. 83,865, led June 6, 1936, wherein such features and their more general availability are more adequately disclosed and claimed.

Another purpose of the herein described invention is to produce a simple pumping device, easy to operate and which requires no attendance other than starting and stopping.

These and other characteristic features, which will become apparent as the description progresses, are attained by the novel and practical construction, combination and arrangement of parts hereinafter described and illustrated in the accompanying drawings, constituting an essential component of this disclosure, and in which:-

Figure 1 is a longitudinal sectional view of a pump made in accordance with the invention.

Figure 2 is a top plan view, looking on line 2-2 of Figure 1, the motor and its casing being ornitted.

Figure 3 is a transverse sectional view taken on line 3-3 of Figure 1.

Figure 4 is a side elevational view of the plunger, drawn to an enlarged scale, together with its associated parts.

Figure 5 is a sectional View taken on line 5-5 of Figure 4.

Figure 6 is a fragmentary plan view of the plunger, valves and shift mechanism.

Figure '7 is a transverse sectional view taken on line L-'I of Figure 5.

Figure 8 is a fragmentary side elevational view of a part of the device drawn to a reduced scale.

Stated in general terms the apparatus consists of a support bracket having a discharge outlet and carrying an enclosed motor on its upper end.

5() Supported by the bracket is a ring provided with an inlet capable of being clamped at any angle relative to the outlet; the ring is further provided with a closed sediment bowl.

Mounted in the bracket is a cylinder provided 55 with an inlet valve at its bottom and having a valve controlling communication with the discharge outlet.

Movable in the cylinder is a plunger, actuated by a motor driven spindle and arranged axially abo-ve the cylinder.

Adjustable means are provided to limit the stroke of the plunger, to the length of the cylinder and cause it to move reciprocatively.

It is to be noted that while the device is shown as adapted for use as a gasoline fuel pump, it has features that render it equally serviceable for other purposes, while sizes and proportions may be varied in accordance with requirements.

More specifically a bracket, generally designated by the numeral I5, has a rearwardly outstanding flange I6, to be secured to any suitable support, and is provided with a depending skirt I1, having a screw threaded annulus I8, at its lower end portion.

Attached by these threads is a ring connection 20, having an inreaching annular flange 2|, and provided with a lateral boss 22 having an inletl opening suited to receive a threaded pipe connecting with a liquid supply source.

A clamp nut 23, threaded on the annulus I8, retains the ring 2i) in adjusted position.

Engaging the under side of the ring connection 20 is the edge of an inverted bowl 2li, drawn tightly against the flange 2|, a cork packing 25 and screen 26 intervening to produce a leak-tight joint.

The bottom of the bowl is seated in a socket 21, in which is threaded a screw 28 provided with a lock nut 29, and having a head Si! engaged by a wire loop 3 I, the raised ends of which are i'lXed in the body of the ring 2, the arrangement being such as to retain the bowl rigidly against the connecting ring. (See Fig. 8.)

The bracket I5 has formed in the under side of its main portion a bevelled annular seal 32 to receive one of the correspondingly bevelled ends of a cylinder 33, which has its opposite lower end fitting a similar seat 3Q in a disc 35 formed on a tubular body 35 extending into the bowl 2li and having a central passage 3l open to it,

The disc 35 is drawn tightly against the end of the cylinder 33 by a plurality of bolts 38 threaded at their upper ends into the bracket I5 and provided with lock nuts 55. Other nuts 4D having closed ends it the bolts below the disc.

Set in the body 36 is a valve seat i2 controlled by a spherical valve 53 to act in admitting liquid from the bowl and prevent its return, and, as will be seen in Figure 1, the bowl is in open communication with the inlet 22.

Above this check valve is a ne screen or strainer 413 and set in an enlarged recess thereabove is a hardened seat 45 t0 receive a thrust bearing ball 16.

The seat IE5 is provided with perforations 41 to permit the passage yof liquid therethrough into the interior of the cylinder 33, through which a spindle 50 passes centrally, the spindle being formed conoavely at its lower end to engage theV thrust ball Il@ and at its upper end is guided in an annular ball bearing v53 set in the upper part of the bracket l5; this spindle is provided with a flattened tang 5l, adapted to interttingly engage the driving shaft 52 of a motor enclosed A in a casing 55 mounted on the upper side of the' bracket l5 and secured to it by bolts 55. Y

A stuffing box 51, engaged in the bracket l5, surrounds the spindle to retain packing below the bearing 53. Y

An outlet 58 formed onV the bracket, is arranged to receive liquid from the top of the cylinder 33, through a passage 5S, controlled by a spring actuated check valve 54, and convey it Y outwardly through pipe connections.

the enlarged views, Figures 4 and 5, cylinder 33- has formed in its inner circumference, throughout its entire length, a right hand square screw thread, eight pitch 65, and cut on the lands of this thread is a left hand 4screw thread of twentyseven pitch, standard V shaped thread 56.

The plunger 62 i's'exteriorly screw threaded with an eight pitch right hand thread 51 having on its periphery a twenty-seven pitch left hand thread 68, in conformity with the threads in the interior of the cylinder.

Formed transversely in the plunger is a central slot 69, adapted to slidingly receive a bar 1l), one end 1l of which is adapted to engage in the grooves of the eight pitch thread 65 and the other end 12 is thickened and has formed on it teeth to engage the threads 66.

The bar 1i] has a central opening 13 elongated to permit movement across the spindle 5I] and has, also, a rectangular opening 14.

A cap 15 is held by bolts 16 to the plunger 62 n and journalled at one end 11 in the cap and at the other end 18 in the plunger is a cam shaft 19 having an integral collar 80 rotatable in a recess in the cap, adjacent t0 which is a cam 8l to operate in the bar opening 14 for shifting the bar 1li.

A collar 82, having a cam profile, is pinned to the end 11 of the cam shaft and a similar collar 83 is secured to the end 18, these collars having their cam faces arranged in opposite relation to make contact with'shift pins 85-85, set respectively in the bracket E5 and disc 35, whereby they give a partial rotation to the cam 8l when the piston arrives at the respective ends of the cylinder.

Such turning of the shaft 19 causes the cam to Vshift the bar 1K3, thus engaging its ends-altercause the plunger to reverse its longitudinal movement.

Due to the relative coarseness of the eight pitch threads the movement of the plunger downward is faster than on its upstroke, and by reason of engagement of the ner threads during its upward or outlet stroke leakage is avoided.

As seen in Figure 5, the shift bar 1i) is move-d to engage the square threads 65, as when the plunger is moving downward.

When the shift pin 85 makes Contact with the cam collar B3, the cam 8l will be partially rotated through rotation of the plunger, moving the bar 1@ to disengage its end 1l from the square threads and engage the thickened end 12 with the threads which, by reason of being left handed, causes the .plunger to rise; such movement being reversed at the opposite end of the stroke in a similar manner.

In order to avoid leakage past the cam shaft 19'the washer 8@ is pressed against the cam 8l by a coiled compression spring di, and the adjacent side of the collar 33 is bevelled to fit a corresponding reoess 88 in the plunger 15.

A plug 89 is removably engaged in the top of the motor casing 55 to permit starting of the motor should it faii to start upon the application of its motive power.

In operation, connections having been made to the inlet 22 and outlet 58, the liquid passes into the bowl 2li, thence past valve (i3, and seat openings ll into the cylinder 33 on upward movement of plunger 62.

When the plunger E2 moves downwardly the liquid passes the valve 54 and through the valve S3 in the cap which forms virtually a portion of the plunger construction into the space above and thence, when the plunger rises, is forced past the valve out of the opening 58.

It should be explained that the V-threads of -the lower cam collar 83V. However, as the ribs of the plunger, though having `v-threads, are in line with the grooves of the cylinder when the plunger nears the limit of its upstroke, engagel ment of the upper shift pin 85 with the upper cam collar 82 throws the end 1l of the bar 19 outwardly into the groove of the cylinder, withdrawing its threaded end 12 and thus leaving the plunger free to return in a downward direction,

and at a relatively greater speed than its upward movement as explained above. While there is some leakage, it is obvious that leakage past the plunger on its downstroke is of little moment, while the engaging V-threads prevent excessive leakage on the upstroke of the plunger.

From the foregoing, it will be seen that a simple device for this purpose has been disclosed in the preferred form of its embodiment, but it is not desired to restrict the details to the exact construction shown, it being obvious that changes, not involving the exercise of invention, may be made without conflicting with the scope of the appended claims.

Having thus described the invention, what is vclaiined as new, and desired to secure by Letters Patent, is

l. In a pump having a cylinder and a plungerl movable reciprocatively therewithin, means for actuating said plunger at a high rate of longitudinal movement in one direction, means for actuating the plunger at a relatively low speed on its reverse stroke, a clutch bar slidable transversely in said plunger, a cam to shift said bar into engagement with either of said actuating means, and means at the end of each full stroke to actuate said cam whereby to cause reverse movement of said plunger.

2. A pump having a cylinder provided with inlet and outlet valves at its closed ends, a square coarse pitched right-hand helix formed in the inner circumference of said cylinder throughout its entire length, a sharp-angled screw thread ci ne left-hand pitch formed on the inreaching lands of said helix, a plunger having peripheral threads corresponding to said helix and'screw threads on the lands of the'helix toengage the threads of said cylinder, a bar slidable transversely in said plunger, one end of said bar being engageable between the ilanks of said helix and the other being thickened and threaded to engage the fine screw threads on the lands of the helix, means to shift said bar to cause engagement at either end selectively, and means to rotate said plunger continuously in one direction whereby said plunger is caused to move reciprocatively.

3. In a pump having a cylinder provided internally with right and left hand screw threads, a plunger having right and left hand threads on its periphery to engage the threads of said cylinder, a cross bar mounted to slide transversely in said plunger and to engage at its opposite ends with either of the threads in said cylinder, a cam to move said bar into engagement with either the right or left hand threads in the cylinder, a shaft for said cam having cam collars fixed at its ends, the cams on said collars being oppositely disposed, and shift pins fixed in the end members of said cylinders to partially rotate said cam collars when said plunger is near the ends of its reciprocal travel.

Il. In a pump, a rotatable spindle, a plunger splined thereto and slidably disposed thereon, a bar slidable transversely of said plunger, a cylinder having means on the Walls adapted to be engaged by one end of the bar for causing a movement of the plunger in one direction, and means engaged by the other end of the bar for causing movement in the reverse direction, a cam carried by the plunger for shifting the bar, and means .at the ends of the cylinder for actuating the cam.

5. In a pump, a rotatable spindle, a plunger splined thereto and slidably disposed thereon, a cylinder having threads on the walls of predetermined pitch, a bartransversely slidable on the plunger and arranged to engage said threads tor moving the plunger in one direction, said cylinder also having threads of different pitch and said bar having threads on the opposite end arranged to engage the last named threads on the cylinder for moving the plunger in the opposite direction, and means for shifting the bar from its engagement with one set of threads to engage the other set at each end of the cylinder.

6. In a pump, a rotatable spindle, a plunger splined thereto and slidably disposed thereon, a cylinder having threads on the walls of predetermined pitch, a bar transversely slidable on the plunger and arranged to engage said threads for moving the plunger in one direction, said cylinder also having threads of different pitch and said bar having threads on the opposite end arranged to engage the last named threads on the cylinder for moving the plunger in the opposite direction, means for shifting the bar from its engagement with one set of threads to engage the other set at each end of the cylinder, said last named means comprising a rotatable cam and a pair of movable members carried by the plunger, and a pin disposed at each end of the cylinder and adapted to engage one of said movable members for actuating the cam.

7. In a pump, a rotatable spindle, a plunger splined thereon, a bar transversely slidable on said plunger, and a cylinder coacting with said plunger, means on the walls of said cylinder adapted to be engaged by one end of the bar for causing a movement of the plunger in one drection, and means n the walls of said cylinder engaged by the other end of the bar causing movement in the reverse direction.

8. In a pump having a cylinder and a plunger movable rotatably and reciprocatively therewithin, means coextensive longitudinally with the path of movement of the plunger for actuating said plunger at a high rate of longitudinal movement in one direction, other means coextensive with the path of movement of the plunger for actuating the plunger at a relatively low speed on its reverse stroke, and means actuated by the plungers movement for automatically shifting from one to the other of said actuating means at the ends of said cylinder.

HART E. DELVIN. 

